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一台韶峰SFC46—1型彩电,开机后伴音正常,但图像左宽右窄,行幅缩小,调换频道后故障现象无明显的改变。该机的故障,多出现于行、场输出电路,如果行逆程电压升高,便会导致行、场幅度变小,因而先检测行逆程电容。经检测,行逆程电容工作均正常,由此估计,该机的故障主要由行输出电路元件损坏或失效所引起。为了防止因行输出管β值减小而造成的故障被忽视,先用一同型号行输出管代替原管,并观看图像变化
A Shaofeng SFC46-1-type TV, boot sound normal, but the image left and right narrow, line width reduced after the change of channel failure phenomenon no significant change. The failure of the machine, appear in the line, the field output circuit, if the line reverse voltage increases, it will lead to the line, the field amplitude becomes smaller, so the first line of detection of the reverse capacitor. After testing, the work of the reverse line capacitance are normal, it is estimated that the failure of the machine is mainly caused by line output circuit components damaged or invalid. In order to prevent the output tube β due to reduced the value caused by the failure is neglected, first with the same type of output pipe instead of the original tube, and watch the image changes